Contact sensor



FIG. 1 is a perspective view of a contact sensor showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is an end view thereof, the opposite end being a mirror image of the end shown;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The broken line showing of rectangular elements as seen in FIGS. 1 & 3 are included for the purpose of illustrating portions of the “article” and forms no part of the claimed design. 

The ornamental design for a contact sensor, as shown and described. 